Add Travis CI configuration.

Author: shulard

.travis.yml

@@ -0,0 +1,49 @@
+language: php
+
+matrix:
+  include:
+    - php: 5.6
+    - php: 7.0
+    - php: 7.1
+      env:
+        - ENABLE_XDEBUG=true
+    - php: 7.1
+      env:
+        - ENABLE_DEVTOOLS=true
+    - php: nightly
+  allow_failures:
+    - php: nightly
+  fast_finish: true
+
+os:
+  - linux
+
+sudo: false
+
+cache:
+  directories:
+    - vendor/
+
+before_script:
+  - if [[ ! $ENABLE_XDEBUG ]]; then
+      phpenv config-rm xdebug.ini || echo "ext-xdebug is not available, cannot remove it.";
+    fi
+
+script:
+  - composer install
+  - if [[ $ENABLE_XDEBUG ]]; then
+      php vendor/bin/phpunit --coverage-clover clover.xml;
+    else
+      php vendor/bin/phpunit;
+    fi
+  - if [[ $ENABLE_DEVTOOLS ]]; then
+      php vendor/bin/phpcs --standard=phpcs.xml;
+    fi
+
+after_script:
+  >-
+    if [[ $ENABLE_XDEBUG ]]; then
+      composer require 'satooshi/php-coveralls:~1.0';
+      echo 'json_path: coveralls-upload.json' > .coveralls.yml;
+      php vendor/bin/coveralls -v --coverage_clover=clover.xml;
+    fi